5) Would a thumbdrive, stand alone version be doable? I can run Construct off a thumbdrive but it's not incredibly stable. And of course it doesn't run on computers without the August 2008 DirectX update... Don't suppose there's any way around that?

It starts up fine, and with the latest build I haven't had any crashes.

6) A plugin for the GameJolt achievements system? I don't have the expertise, but it seems like it wouldn't be too hard. I don't know if you could do it with events, but I'd be glad for someone to prove me wrong.